'sales dipped' is correct and usable in written English.
You can use this phrase when you are describing a decrease in sales. For example, "The company's sales dipped significantly after the holiday season ended."
Quarterly sales dipped to $1.83 billion from $1.97 billion.
DaimlerChrysler's sales dipped 4.8percentt, including its Mercedes division.
Sales dipped by 3% once new store openings were excluded.
The series became increasingly uninspired and sales dipped.
For the year, sales dipped 1percentto to $2.49 billion.
Retail sales dipped 0.3 percent after a 1.3 percent increase in September, the Commerce Department said.
The German retailer Metro said its sales dipped 3.6 percent in 2009.
The German retailer Metro said its sales dipped 3.6 percent during 2009.
But when sales dipped with the economy, the systems, which were heavy and costly, faded away.
Overall, sales dipped only a fraction of a per cent compared to last year.
The value of retail sales dipped by 0.3% in January, as car sales fell sharply.
